Description

This recipe reduces a single IFU frame (i.e. no sky subtraction or coadding is carried out).

Read-noise and Poisson variances are added to the frame and a bad pixel mask is applied. The spectrum from each slice of the IFU is cut out of the frame and pasted in a new frame in such a way that there are no longer spaces between the spectra, the spectra are arranged in the order in which they appear in the field of view and they are approximately aligned in the dispersion direction. The spectrum is flat-fielded and the wavelength calibration measured from the arc spectrum is used to apply a common, linear wavelength scale to each row of the the 2-d spectrum.

Once all the rows of the image are scrunched to a common linear wavelength scale the 2-d spectrum from each slice is cut out and used to form a single (y, $\lambda$) plane of the (x, y, $\lambda$) datacube.